An account in Alameda County, California

In late high school (1990), a group of my friends drove out of Livermore, CA down Arroyo Road. The time of year was likely Spring or Summer as I do not recall it being cold. At the end of Arroyo at the time, or off a turn off, was a pumping station for the local reservoir. We parked in the street. The reason for this trip was a trek to the ruins of a former mental hospital. Unclear if there was a more direct road but Arroyo road was desolate and rarely used at that point. We thought it would be fun and had attempted this journey before but were never successful. I was driving one of the 2 cars. It was after dark. The other driver and I got out of the cars and turned towards the hillside behind us. I was shining a flashlight along the hill and almost immediately notice a tall furry brown creature walking on 2 legs from left to right for about 30 to 40ft. This was approximately 40 ft away. The other driver was next to me and I asked "Are you seeing what I am..." I couldn't finish the sentence before he replied "Yes i am". I continued shining the light on the creature as it moved to the right and then started up the hillside and disappeared. As the others were getting out of the car, the other driver and i quickly discussed that we wouldn't mention this to the others as it would only scare them. We gathered flashlights and then proceeded up the hill behind the cars. I had been part of 3 or 4 previous trips to this location and had never been scared before like I was that night. Instead of shining the light ahead I was constantly shining it behind and around us looking for the creature. I was and am still convinced that what I saw was a bigfoot. So was the other driver. We later shared with the group who dismissed our sighting as a bear or some other creature. It was not a bear. It was tall, dark brown and clearly walked on 2 legs. While we had about 10 or so people in our party. Only the other driver and I witnessed the creature. Neither of us had anything to drink or any other substance.